The wax of the candle melts, then vaporizes and burns. Here Melting of wax is a physical change as no new substance is formed and the melted wax can be converted back to solid wax.
When the wax burns, two new substances are formed which are water and carbon dioxide. So, it’s a chemical change. we can not take back solid wax from carbon dioxide and water.
In LPG both the chemical and physical changes take place. As we know LPG is present as a liquid form in the cylinder.
Here the physical change occurs when it comes out of the cylinder. That time it converts into gaseous form.
When that gas burns in the air it converted into carbon dioxide and water undergoes a chemical change.